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dwarf2out: Use normal constant values in bound_info if possible.

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* dwarf2out.c (add_bound_info): If HOST_WIDE_INT is big enough,
	then represent the bound as normal constant value.

From-SVN: r209473
This commit is contained in:
Mark Wielaard 2014-04-17 10:36:21 +00:00 • committed by Mark Wielaard
parent 5a65129e4e
commit 79896351cb
2 changed files with 28 additions and 13 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
2014-03-20 Mark Wielaard <mjw@redhat.com>
* dwarf2out.c (add_bound_info): If HOST_WIDE_INT is big enough,
then represent the bound as normal constant value.
2014-04-17 Jakub Jelinek <jakub@redhat.com>
PR target/60847

36
gcc/dwarf2out.c
View file

@ -16203,21 +16203,31 @@ add_bound_info (dw_die_ref subrange_die, enum dwarf_attribute bound_attr, tree b
&& tree_to_shwi (bound) == dflt)
;
/* Otherwise represent the bound as an unsigned value with the
precision of its type. The precision and signedness of the
type will be necessary to re-interpret it unambiguously. */
else if (prec < HOST_BITS_PER_WIDE_INT)
{
unsigned HOST_WIDE_INT mask
= ((unsigned HOST_WIDE_INT) 1 << prec) - 1;
add_AT_unsigned (subrange_die, bound_attr,
TREE_INT_CST_LOW (bound) & mask);
}
else if (prec == HOST_BITS_PER_WIDE_INT
/* If HOST_WIDE_INT is big enough then represent the bound as
a constant value. We need to choose a form based on
whether the type is signed or unsigned. We cannot just
call add_AT_unsigned if the value itself is positive
(add_AT_unsigned might add the unsigned value encoded as
DW_FORM_data[1248]). Some DWARF consumers will lookup the
bounds type and then sign extend any unsigned values found
for signed types. This is needed only for
DW_AT_{lower,upper}_bound, since for most other attributes,
consumers will treat DW_FORM_data[1248] as unsigned values,
regardless of the underlying type. */
else if (prec <= HOST_BITS_PER_WIDE_INT
|| TREE_INT_CST_HIGH (bound) == 0)
add_AT_unsigned (subrange_die, bound_attr,
TREE_INT_CST_LOW (bound));
{
if (TYPE_UNSIGNED (TREE_TYPE (bound)))
add_AT_unsigned (subrange_die, bound_attr,
TREE_INT_CST_LOW (bound));
else
add_AT_int (subrange_die, bound_attr, TREE_INT_CST_LOW (bound));
}
else
/* Otherwise represent the bound as an unsigned value with
the precision of its type. The precision and signedness
of the type will be necessary to re-interpret it
unambiguously. */
add_AT_double (subrange_die, bound_attr, TREE_INT_CST_HIGH (bound),
TREE_INT_CST_LOW (bound));
}